166643204 has 48 divisors (see below), whose sum is σ = 364334208. Its totient is φ = 64931328.

The previous prime is 166643201. The next prime is 166643219. The reversal of 166643204 is 402346661.

It is not an unprimeable number, because it can be changed into a prime (166643201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20972 + ... + 27804.

It is an arithmetic number, because the mean of its divisors is an integer number (7590296).

Almost surely, 2^166643204 is an apocalyptic number.

166643204 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166643204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182167104).

166643204 is an abundant number, since it is smaller than the sum of its proper divisors (197691004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166643204 is a wasteful number, since it uses less digits than its factorization.

166643204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924 (or 6922 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 166643204 is about 12909.0357502023. The cubic root of 166643204 is about 550.2953829311.

Adding to 166643204 its reverse (402346661), we get a palindrome (568989865).

The spelling of 166643204 in words is "one hundred sixty-six million, six hundred forty-three thousand, two hundred four".